All you have to do is examine their records: https://www.congress.gov
Or read a WaPo article that not only examines those records, but performs a study to see if the actual data confirms “anecdotal impressions.”
Because the WaPo is so often written off by Sanders’ supporters as a part of the “corporate media conspiracy” I did both.
During her eight years in the Senate, Hillary Clinton sponsored 10 bills that passed the chamber. The average senator passes 1.4 bills a year. Clinton passed 1.25 bills per year. Bernie Sanders has been in the Senate nine years and has sponsored only one bill that passed.
Clinton amended bills 67 times in her eight years in the Senate. Sanders did so 57 times in nine years. That’s 8.4 per year for Clinton and 6.3 per year for Sanders — 33 % more amendments per year than Sanders.